Synonyms for reason

noun

1. The power of reasoning

   understanding, intelligence, mind, sanity; see acumen, judgment 1.

2. A process of reasoning

   logic, intellection, dialectics, speculation, generalization, rationalism, argumentation, inference, induction, deduction, discernment, analysis, ratiocination, rationalization.

3. A basis for rational action

   end, object, rationale, intention, motive, ulterior motive, basis, wherefore, aim, intent, cause, design, ground, impetus, idea, motivation, root, incentive, goal, purpose, the why and wherefore; see also cause 1, purpose 1.

4. The mind

   brain, mentality, intellect; see mind 1. See syn. study at cause.

by reason of

in reason

out of all reason

stand to reason

with reason

within reason

verb

1. To think logically

   reflect, deliberate, contemplate; see think 1.

2. To seek a reasonable explanation

   suppose, infer, deduce, gather, draw from, conclude, generalize, adduce, rationalize, think through, study, analyze, examine, figure out, thresh out*; see also assume 1, infer 1.

3. To discuss persuasively

   argue, trace, contend, dispute, debate, demonstrate, point out, prove, establish, discourse, justify; see also argue 1, discuss. See syn. study at think.